1.Three coins are tossed simultaneously Using addition theorem
on probability, find the probability that either exactly two tails or at least
one head turn up.
2.A letter is chosen at random from the letters of the word
“ENTERTAINMENT”. Find the probability that the chosen letter is a vowel or T.
(repetition of letters is allowed).
3.
Eight men and twelve boys can
finish a piece of work in 10 days while six men and eight boys can finish the
same work in 14 days. Find the number of days taken by one man alone to
complete the work and also one boy alone to complete the work.
